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Other Intangible Assets (Tables) | 9 Months Ended
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Jun. 30, 2012
Other Intangible Assets [Abstract] |
Intangible assets balances, subject to amortization |
|  | June 30, 2012 |  |  | September 30, 2011 |
|  | Gross Carrying Value |  |  | Accumulated Amortization |  |  | Net Carrying Value |  |  | Gross Carrying Value |  |  | Accumulated Amortization |  |  | Net Carrying Value |
Supply agreement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance, beginning of period |  | $ | 17,580 |  |  | $ | (6,052 | ) |  | $ | 11,528 |  |  | $ | 17,580 |  |  | $ | (4,881 | ) |  | $ | 12,699 |
Amortization |  |  | — |  |  |  | (879 | ) |  |  | (879 | ) |  |  | — |  |  |  | (1,171 | ) |  |  | (1,171 | )
Balance, end of period |  | $ | 17,580 |  |  | $ | (6,931 | ) |  | $ | 10,649 |  |  | $ | 17,580 |  |  | $ | (6,052 | ) |  | $ | 11,528 |
Purchased technology |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance, beginning of period |  | $ | 11,747 |  |  | $ | (7,759 | ) |  | $ | 3,988 |  |  | $ | 10,272 |  |  | $ | (6,318 | ) |  | $ | 3,954 |
Acquisition |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 1,500 |  |  |  | — |  |  |  | 1,500 |
Amortization |  |  | — |  |  |  | (1,404 | ) |  |  | (1,404 | ) |  |  | — |  |  |  | (1,689 | ) |  |  | (1,689 | )
Foreign currency translation |  |  | 9 |  |  |  | 228 |  |  |  | 237 |  |  |  | (25 | ) |  |  | 248 |  |  |  | 223 |
Balance, end of period |  | $ | 11,756 |  |  | $ | (8,935 | ) |  | $ | 2,821 |  |  | $ | 11,747 |  |  | $ | (7,759 | ) |  | $ | 3,988 |
Non-compete agreements |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance, beginning of period |  | $ | 4,170 |  |  | $ | (4,170 | ) |  | $ | — |  |  | $ | 5,365 |  |  | $ | (3,666 | ) |  | $ | 1,699 |
Amortization |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (920 | ) |  |  | (920 | )
Foreign currency translation |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (35 | ) |  |  | — |  |  |  | (35 | )
Impairment (a) |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (1,160 | ) |  |  | 416 |  |  |  | (744 | )
Balance, end of period |  | $ | 4,170 |  |  | $ | (4,170 | ) |  | $ | — |  |  | $ | 4,170 |  |  | $ | (4,170 | ) |  | $ | — |
Trade name |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance, beginning of period |  | $ | 1,098 |  |  | $ | (767 | ) |  | $ | 331 |  |  | $ | 5,437 |  |  | $ | (938 | ) |  | $ | 4,499 |
Amortization |  |  | — |  |  |  | (147 | ) |  |  | (147 | ) |  |  | — |  |  |  | (583 | ) |  |  | (583 | )
Foreign currency translation |  |  | — |  |  |  | 95 |  |  |  | 95 |  |  |  | (124 | ) |  |  | (1 | ) |  |  | (125 | )
Impairment (a) |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (4,215 | ) |  |  | 755 |  |  |  | (3,460 | )
Balance, end of period |  | $ | 1,098 |  |  | $ | (819 | ) |  | $ | 279 |  |  | $ | 1,098 |  |  | $ | (767 | ) |  | $ | 331 |
Total |  | $ | 34,604 |  |  | $ | (20,855 | ) |  | $ | 13,749 |  |  | $ | 34,595 |  |  | $ | (18,748 | ) |  | $ | 15,847 |
(a) | Represents an impairment charge recorded in fiscal 2011 related to the intangible assets of Powell Canada.

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- Definition Tabular disclosure of assets, excluding financial assets and goodwill, lacking physical substance with a finite life, by either major class or business segment. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=7658586&loc=d3e16323-109275 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=7658586&loc=d3e16265-109275 + Details
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